#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include<string.h>
#include<stdlib.h>

int main()
{
	int a;
	int* p = NULL;
	if (p == NULL)
	{
		p = &a;
		*p = 200;
		printf("%d\n", *p);
	}
	system("pause");
	return 0;
}